Gearing.



J. BURKS.

GEARING.

APPLICATION FILED APR.6, 1911.

1,033,534. Patented July 23,1912.

2 SHEETS-SHEET 1.

J2me; Burk? COLUMBIA PLANOGRAPH co., WASHINGTON. 1). C1

J. BURKS.

GEARING.

APPLICATION FILED APILB, 1911. 1,033,534. Patented July 23,1912.

' 2 SHEETS-SHEET 2.

ammwwtoz o/ames BM 7W3 JAMES BURKS, OF KORAN, LOUISIANA.

GEARING.

Specification of Letters Patent.

Patented July 23, 1912.

Application filed April 6, 1911. Serial No. 619,332.

To all whom 'it may concern:

Be it known that I, JAMES Bunxs, a citizen of the United States,residing at Koran, in the parish of Bossier, State of Louisiana, haveinvented certain new and useful Improvements in Gearing; and I do herebydeclare the following to be a full, clear, and

exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to sewing machines more particularly to springmotor driven sewing machines.

An object of the present invention is to equip a sewing machine with atrain of gearing for transmitting the power from the spring motor to thesewing mechanism, this train of gearing by virtue of novel adjustablymounted ournal boxes being capable of stepping up or stepping down thespeed of the sewing mechanism.

A further object of the invention is to provide a novel form of stirrupby means of which the operator may stop or start the spring motor.

lVith the above objects in view the invention consists in certain noveldetails of construction and combination of parts hereinafter fullydescribed and claimed, it being understood that various modificationsmay be made in the minor details of construction within the scope of theappended claims.

In the accompanying drawing forming part of this specification :F igure1 is a front elevation of a sewing machine equipped with a spring motorand transmission gear.- ing embodying my improvements. Fig. 2 is a crosssectional view taken on the line 22 Fig. 1. Fig. 3 is a cross sectionalview taken on the line 33 Fig. 1. Fig. 4 is a fragmentary perspectiveview showing the construction of one of the shaft boxes. Fig. 5 is afragmentary perspective view showing the construction of the stirrup.Fig. 6 is a fragmentary view in elevation showing the crankconstruction.

Referring now to the drawing in which like characters of referencedesignate similar parts, a sewing machine is shown comprising a table10, sewing mechanism 11, and leg frames 12 supporting the table, eachleg frame comprising spaced legs connected by a plurality oftransversely disposed cross braces 13. A pair of bearing boxes 14 aremounted on the uppermost cross braces of the leg frames and the oppositeends of a shaft 15 are journaled in these boxes, this shaft beingequipped with a band wheel 16 which underlies the driving wheel 17 ofthe sewing mechanism and which is coupled to the latter by a flexibleleather belt 18 or the like. A gear 19 is removably secured to thisshaft, and forms means for driving the shaft. A practical method ofmounting the gear is to provide the shaft with a longitudinal groove inwhich a set screw or similar fastener threaded through the hub of'thegear fits, unloosening of this set screw permitting of the gear beingslid off from the end of the shaft and replaced wit-h a larger orsmaller gear as the case may be in order to step up or step down thespeed of the sewing mechanism. The journal boxes 14 are equipped withset screws 20 which work in grooves or the like formed in the oppositeends of the shank and when these set screws are loosened, the shaft maybe slid bodily through the journal boxes in order to permit of theremoval of the gear 19.

Formed in the intermediate cross braces of the legs are verticallydisposed slots 21 in which are slidingly fitted journal boxes 22, agroove 23 being formed in one wall of each slot to receive a rib 24;formed on one side of the related journal box whereby to guide thesliding movements of the box. A set screw 25 threaded through the loweredge of each intermediate cross brace bears against the underneath faceof the related journal box and forms means for moving the box verticallyin its slot.

The opposite end portions of a shaft 26 v are ournaled in the slidingjournal boxes and this shaft is equipped with a gear 27 which mesheswith and drives the gear 19. It is now clear that should the gear 19 bereplaced with a smaller gear than usual, the set screws 25 may be avanced in order to move upwardly the shaft 26 bodily and permit of thegear 27 meshing with the smaller gear. If the gear 19 is replaced with alarger gear than ordinary, the set screws 25 are retracted, permittingof the gear 27 moving bodily downward and meshing with the larger gear,this meshing of the gears positively preventing jumping up of thejournal boxes 22.

A spiral spring 28 is fixed at its inner end to the shaft 26, and at itsouter end to the inner wall of a rectangular casing 29 which isslidingly supported between spaced studs 30 formed on the intermediatecross brace of that leg frame remote from the gears above described. Oneend of the shaft 26 projects considerably beyond its journal box and isequipped with a crank handle 30, which forms means for winding thespring, a ratchet wheel 31 being fixed to the shaft and a springcontrolled pawl being arranged to operativoly engage this ratchet wheeland prevent unwinding of the spring during the winding operation, thispawl being released after the winding ope ation is finished "to permitof the spring unwinding and rotating the shaft 26.

It is evident that upon the release of the pawl 32, the spiral springwill immediately con'n'nence to unwind and drive the sewing mechanismthrough the train of gearing above described, and to permit of stoppingthis train of mechanism a stirrup 33 is provided with a cylindricalstein 34L which is journaled in a suitable opening formed in a strut 36which connects both leg frames of the sewing machine adjacent theirlower ends. The upper end of the shank terminates in a square head 37which engages with the teeth. of the ratchet wheel 27, this headnormally being held in engaged position by a helical. spring 58 theopposite terminal convolutions of which bear against the confrontingfaces of the strut and head as clearly shown in Fig. 5. When it isdesired to start the sewing mechanism, it is simply necessary to insertthe foot in the stirrup and bear down, thereby releasing the head fromengagement with the gear 27.

e The stirrup is held eluding a supporting frame,

on said frame, a pair of oppositely disposed 55 ournal boxes on saidframe movable bodily toward and away from said driven shaft, a

erativ-e connect-ion between said 7 guides on said frame ad acent to oneof said 60 in this depressed posit-ion while a: continued actuation ofthe sewing mechanism is desired, the foot being removed from the stirrupto permit of the head of the stirrup shank moving back into 40engagement with and stopping the train of r gearing when stopping of thesewing mechanism is desired.

What 18 claimed, is 2- l. A power transmission mechanism ineluding asupport-mg frame, a driven shaft on said frame, a driving shaft on saidframe adapted to he slid bodily toward and away from the driven shaft,an operative connection between said shaft-s, ried by the driving shaftand slidably fitted on guides carried by said frame.

:2. A power transmission mechanism in a driven shaft driving shaftjournaled in said boxes, an op shafts,

journal boxes, and a motor carried by said driving shaft and slldablyengaglng said guides.

In testimony whereof, I affix my signature, in presence of twowltnesses.

JAMES BURLS.

\Vitnesses LOUIS BURKE, Bos'r l-IALNER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

and a motor car-

